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SubjectRe: [PATCH] net: mana: Prefer struct_size over open coded arithmetic
Hi,

On Sat, Sep 11, 2021 at 12:28:18PM +0200, Len Baker wrote:
> As noted in the "Deprecated Interfaces, Language Features, Attributes,
> and Conventions" documentation [1], size calculations (especially
> multiplication) should not be performed in memory allocator (or similar)
> function arguments due to the risk of them overflowing. This could lead
> to values wrapping around and a smaller allocation being made than the
> caller was expecting. Using those allocations could lead to linear
> overflows of heap memory and other misbehaviors.
>
> So, use the struct_size() helper to do the arithmetic instead of the
> argument "size + count * size" in the kzalloc() function.
>
> [1] https://www.kernel.org/doc/html/v5.14/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments
>
> Signed-off-by: Len Baker <len.baker@gmx.com>
> ---
> drivers/net/ethernet/microsoft/mana/hw_channel.c | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/net/ethernet/microsoft/mana/hw_channel.c b/drivers/net/ethernet/microsoft/mana/hw_channel.c
> index 1a923fd99990..0efdc6c3c32a 100644
> --- a/drivers/net/ethernet/microsoft/mana/hw_channel.c
> +++ b/drivers/net/ethernet/microsoft/mana/hw_channel.c
> @@ -398,9 +398,7 @@ static int mana_hwc_alloc_dma_buf(struct hw_channel_context *hwc, u16 q_depth,
> int err;
> u16 i;
>
> - dma_buf = kzalloc(sizeof(*dma_buf) +
> - q_depth * sizeof(struct hwc_work_request),
> - GFP_KERNEL);
> + dma_buf = kzalloc(struct_size(dma_buf, reqs, q_depth), GFP_KERNEL);
> if (!dma_buf)
> return -ENOMEM;
>
> --
> 2.25.1
>

I have received a email from the linux-media subsystem telling that this
patch is not applicable. The email is the following:

Hello,

The following patch (submitted by you) has been updated in Patchwork:

* linux-media: net: mana: Prefer struct_size over open coded arithmetic
- http://patchwork.linuxtv.org/project/linux-media/patch/20210911102818.3804-1-len.baker@gmx.com/
- for: Linux Media kernel patches
was: New
now: Not Applicable

This email is a notification only - you do not need to respond.

The question is: Why it is not applicable?. I have no received any bad comment
and a "Reviewed-by:" tag from Haiyang Zhang. So, what is the reason for the
"Not Applicable" state?.

Regards,
Len

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